- Crust - cool, lightweight, brittle, which floats on top of mantle. It is the outer layer of earth. Tectonic processes reshape continents and also cause earthquakes - Tectonic plates- plates caused by convection currents in the mantle that causes earthquakes. - Ocean basins form where continents crack and pull apart. - Magma – is molten rock
The Connecticut river valley was also formed from many rifts and faults that had developed. A rift valley is a region of lowland that forms where tectonic plates move apart, which is how the river valley was formed. On the other hand, the plate tectonics also formed the Appalachian mountains. The Appalachian mountains were formed by convergent boundaries, which is when two plates collide. The
The idea of catastrophism or “consecutive creations”, is the theory that changes earth’s crust geological history from sudden violent and unusual events. Catastrophism is the idea that Earth has been affected in the past by sudden, short-lived, violent events, possibly worldwide in space. This view holds that the present is the key to the past, and that all things continue as they were from the beginning of the
INTRODUCTION The Cretaceous Period, spanning 65.5-146 million years ago (Mya), was a world different from what we are familiar with today. Planetary changes during this period included the extinction of dinosaurs and drastic global warming. The breakup of the super continent Pangea had started about 30 Mya, and seaways had begun to form and cover landmass that had once been a part of the super continent (Geologic Time). Today, scientists know that one of these landmasses, the North American continent as we now know it, was at one point covered by a vast inland sea known as the Western Interior Seaway.
The Canadian Shield is arguably the best land form region. Tectonic forces and glaciation have combined to shape the Canadian shield, making it different from other Canadian landform regions, directly affecting economic activity. Firstly, Tectonic Activity created the base of the Canadian Shield is 2.5 billion years old craton made of igneous rock. Tectonic activity directly affects the Canadian Shield to this day, because many economic activities take place on the rock.
The two plates that moved were the North American tectonic plate and the Pacific tectonic plate. The plates moved about 15 feet, this is huge because the average movement of tectonic plates during an earthquake is only 2 inches. The earthquake only lasted a minute but it quickly destroyed the city. The earthquake
How do earthquakes form? Earth quakes form when two earth blocks slide past each other. When they slip past each other it is called a fault. Earth quakes
The Oceanic plate is pushed under the continental plate causing volcanos and the land to be pushed inward causing the land to rise forming mountains (United States). Glacier are made from snow that is then compressed over the years that it turns into ice, they can be formed on both
The earth is like a jigsaw puzzle, it moves in someway or another all of the time. The tectonic plates that form the surface of the Earth are often sliding against each other, which triggers earthquakes. The 1960 Chile Earthquake was the largest earthquake ever recorded which had a tremendous impact not only on the immediate area and the people living there, but also on the rest of the world. The 1960 was the largest earthquake ever recorded.
This view had already been studied by Wegener and du Toit, but they could not come up with an accurate way to prove their theory. However, in 1965, Sir Edward Bullard, an English geophysicist was able to show a direct fit to the continents by looking at the continental slope along the coastal region of the continents. He discovered the best method to measure and prove this thought was to measure the continental slope at a depth of 2000 meters. At this depth, you find proof that the continents were at one time all
The Choctaw had a story in which they describe how the earth was made. The earth is describes as floating and suspended by cords. The believed that the earth would grow old and the people would die and that the earth fall and begin anew. Once this happen the earth would be very wet and soft. The animals wanted to be free and birds were sent out to see if the land was dry.
However, today the continents will not fit together as they once did, some would over lap and some would have huge, spacious gaps filled with ocean. This is due to the weathering and erosion of rocks.
The term continent, is not in reference to the earths 7 continents or dry land, but is is reference to what is continent and as being able to hold water. Insular, is his use, is used to describe something that relates
At the time is was believed that Earth was the center of the
Earthquakes are caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two plates are rubbing against each other, they stick a little. Most earthquakes occur along the edge of the oceanic and continental plates. Due to stress they shift and cause the earthquake.
